David Edmondson <d...@dme.org> writes:
> Using current emacs git head, talking to outlook.office365.com over
> IMAP.
>
> Attempts to use gnus-search always fail with the server reporting:
>
> (("NO" ("BADCHARSET" "(US-ASCII)") "The" "specified" "charset" "is" "not"
> "supported."))
>
> Looking at gnus-search.el, `gnus-search-imap-search-command' always
> sends CHARSET UTF-8 if the server supports literal+ (which this one
> does). Sending US-ASCII (or no charset at all) causes the server to
> return the required results in simple test cases.
>
> Is there a way to determine whether a server supports UTF-8 in searches,
> and adjust the command sent accordingly? If not, could the use of UTF-8
> be controlled with (yet another!) variable?
A bit of internet research seems to indicate that Exchange can't handle
UTF-8 encoded search strings, and also there's no way to test that in
advance apart from simply seeing if it errors. Awesome!
I think what this means is that it's impossible to search for non-ascii
text on an Exchange server (can that be true?!). If that's true, then
the imap search command should be using the presence of a multibyte
string as the test for whether to use CHARSET UTF-8 or not. You're not
going to be able to search for a multibyte string, anyway.
Would you try eval'ling the below, and tell me if it works okay when
searching for a string with no non-ascii characters in it?
Also, when you do get the error message above, how does that present to
the user? Did you have to go digging to find it?
(cl-defmethod gnus-search-imap-search-command ((engine gnus-search-imap)
(query string))
"Create the IMAP search command for QUERY.
Currently takes into account support for the LITERAL+ capability.
Other capabilities could be tested here."
(with-slots (literal-plus) engine
(when (and literal-plus
(string-match-p "\n" query))
(setq query (split-string query "\n")))
(cond
((consp query)
;; We're not really streaming, just need to prevent
;; `nnimap-send-command' from waiting for a response.
(let* ((nnimap-streaming t)
(call
(nnimap-send-command
"UID SEARCH CHARSET UTF-8 %s"
(pop query))))
(dolist (l query)
(process-send-string (get-buffer-process (current-buffer)) l)
(process-send-string (get-buffer-process (current-buffer))
(if (nnimap-newlinep nnimap-object)
"\n"
"\r\n")))
(nnimap-get-response call)))
(t (nnimap-command "UID SEARCH %s" query)))))
